What the meaning of 404, 303 Error ?

404 an error message displayed by a browser indicating that an Internet address cannot be found.
303 The server is redirecting the user agent to a different resource
 
The HTTP response status code 303 See Other is a way to redirect web applications to a new URL.
404 Not Found Error means that the webpage you were trying to reach could not be found on the server.
 
303 ERROR: The response to the request can be found under a different URI and SHOULD be retrieved using a GET method on that resource. This method exists primarily to allow the output of a POST-activated script to redirect the user agent to a selected resource. The new URI is not a substitute reference for the originally requested resource. The 303 response is not cachable, but the response to the second (redirected) request MAY be cachable.
If the new URI is a location, its URL SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s).

404 ERROR: The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.
If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.
 
A 404 error is an HTTP status code that means that the page you were trying to reach on a website couldn't be found on their server. The 404 Not Found error might appear for several reasons even though no real issue exists, so sometimes a simple refresh will often load the page you were looking for. The most common method is to retry the web page by pressing F5, clicking the refresh/reload button, or trying the URL from the address bar again.
 
404 or not found error message is generated by the website hosting server when a user attempts to follow a broken or dead link. In other words, this error code indicates that the client (user) was able to communicate with the server but the server could not find what was requested.
The HTTP response status code 303 See Other is a way to redirect web applications to a new URI, particularly after an HTTP POST has been performed,
 
Most of you, throughout your travels around the internet, can have seen associate degree 'HTTP 404 Not Found' response page, maybe once attempting to follow a broken link from a research engine. this can be the closest that almost all individuals can come back to directly interacting with the HTTP protocol. The '404' may be an HTTP standing code and their is a long list of different HTTP standing codes, most of that you may ne'er encounter unless you're writing server-side programs that use the HTTP protocol to speak between 2 servers. the sole exception to the current that I will think about is that if you're a internetmaster exploitation 'error redirection' on your web server.
 
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